Bolt anchor



1. KENNEDY.

BOLT ANCHOR.

APPLICATXON FILED APR. 3, 1920.

1,410,259, Patented Mar. 21, 1922.

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JOSEPH KENNEDY, 0F NEW YORK, N. Y., SSIGNOR T0 JOI-IN EDWARD OGDEN, OF

MOUNTANVILLE, NEW YORK.

BOLT ANCI-IOR.

il,d10,259.

Specification of .Letters Eatent.

Patented Mar. 21, A1922.

Original application filed March 29, 1919, Serial No. 286,126. Divided and this application tiled April 3,

' 1920. Serial No. 370,952.

yused for bolt anchorages and to a new and useful method oi making 4such shields ott sheet metal.

The object of this invention is to provide a simple and inexpensive device which may be effectively used to hold a bolt or screw in material such as brick, stone or cement, withwhich the threaded device cannot obtain a secure hold directly.

Another object is to provide a simple and inexpensive method ot making such expansion shields.

In order that the invention may be thoroughlyunderstood, I will now proceed to describe the saine in the following specification and will then point out the novel features thereof in appended claims.

This application isa division of application, Serial No. 286,126, filed by nie ll'iarch 27th, '1919, which was a continuation in part of cci-pending applications-which matured May 29th, 1919 as Patents Nos. 1,304,885, 1,304,886 and 1,304,887.

l Referring to the drawings: l

Figure l is a plan view of a blank of sheet metal showingits form betoreit is bent, from which an expansion shield which einbodies this invention may be made. rIhis blank is perforated in a manner which provides 'for the projecting flanges being notched in the manner suggested onpage 2, line 2l of the aforesaid Patent :ti-1,304,885.

Figure 2 is an elevation of an expansion shield made from a blank like that shown in Figure l.A

Figure 3 is va bottom plan view ot the de vice shown in Figure 2; and y Figure 4 1s a top planview ot the saine device.

Like reference charactersdesignate corresponding parts in all of the figures.

is an undivided blank of sheet metal of arcuate torni. This is provided with a plurality of indentations 5l at its edges and .a plurality of pertorations 52 on lines F-F, (i-G, HHH, I-I, .L-J, K-K and L-Ii which diverge or lie in a fan-like relation. rihese perforations may increase in width toward the wider end of the blank along' seine such lines as thus indicated by the broken linesl f-f. 4 The perforations on the lines G-G, I-I and I-I lie on transverse spiral lines such as IVI-M which pass through the center ot' two of the notches 5l on the edges of the blank. The perforations on the lines F-F, II-II, J-J and L-L lie on, spiral lines such as lT-N which are intermediate those ot the perforations previously pointed out.

In forming the shield the edges of the blank 5() are bent inwardly and the metal of the blank near the lines lGf-(zr, I-I ands i5-K is pinched together on the saine side. The metal ot the blank near the lines F-F,

'Il d I J and Lwli is pinched together in ther opposite direction. rI'lie metal thus pinched together 'forms multi-ply tapered ribs projecting 'from opposite sides ot' the blank. n. greater amount of the metal near the wider end oi the blank is thus pinched together than near the narrower end oit the blank, in order to form the desired taper. In tact, the excess ot metal thus pinched together near the wider end ot the blank is suiiicient to contract this lower edge 'of the blank to make it shorter than the upper edge. -V n After these ribs have been formed and the edges ot' the bla-nk bent as described. the tube is completed by folding the metal about a central axis to torni a shield such in Figures 2, 3 andl. i

The construction is such that the Voutwardly projecting ribs will have a plurality of teeth 53 and the inwardly projecting,r ribs will have aplurality ot teeth 54.-. The teeth 5a are preferably so arranged that they lie in a helix of the same pitch as that of the screw which is to be used with rthe shield, so that the teeth of the screw will readily engage with them. "I he teeth 'e 53 will lie in a helix 0f the same pitch, but

will be between the teeth 54 on the inwardly projecting ribs.

The structure thus described is a tapered tube having both inward and outward ribs which progressively increase in height freni the larger to the smaller end of the tube. The tube, however, may be cylindrical with tapered' inner and outer ribs, or if preferred, either the inner or the outer ribs may be tapered and not the others. t is also entirely Within the scope of this .invention to provide either inwardly projecting or'outwardly projecting ribs. lt is, how ever, desirable to make ythe tube of a blank of the general arcuate forni shown, in order to providean excess of nieta-l at the inner end of the tube and to provide a tapered bore either of the shell of' the tule or of such toothed inner ribs as thus described,

in order to provide for the expansion of the device when a bolt is screwed into it. lit is only necessary that this taper be formed at some time before the bolt is to be inserted and this taper may be formed by ldriving to forni spaced perforations.

the shield into a cylindrical hole prepare-'gl for 1t, which act will contract the inner end of the shield, if it has not been previ- `ouslyconstructed with the tapered bore.

What l `"claiin is: Y l. An expansion shield of sheet metal with parts of the metal folded to form multi-ply ribs, and folded transversely into a tube having edges ofthe metal extending from one end tothe other thereof, the parts which are thus folded being first cut away to form spaced perforations.

2. An expansion shield of sheet nietal with parts thereof bent to forni longitudinal in dentations, and folded transversely into a tube having edges of the metal extending from one end to the `other thereof, the parts which are thus bent being first cut away Y e. An expansion shield of sheet nietal with parts of thelnietalfolded to forni multi-ply ribs and'other part-s bent to form ,indenta tions substantiallyl parallel with said ribs, and folded transversely into a tube having edges of the metal extending from one end to the other thereof, the parts which thus foldeduand the parts which are thus being` bent first cut away to forin tapered perforations.

An expansion shield formed from a blank of sheet .rnetal having a smaller transverse dimension near one end thanat other parts thereof, with parts of the metal folded to forni tapered multiply ribs, other parts of the metal bent to form tapered indentations substantially parallel with said ribs, and folded transversely into a tube having edges of the metal extending from one end to 'the other thereof, the parts which are thus folded and the parts which are thus bent being first cut away to form spaced periiorations on transverse lines so inclined as to lie in helices in the finished tube.

6. An expansion shield formed from a blank of sheet nietalhaving a smaller transverse dimension near one end than at other parts thereof, with parts of the metal folded to forni tapered multi-ply ribs, other parts of the metal bent to forni tapered indentations substantially. parallel with said ribs, and folded transversely into a tube having edges of lthe metal extending from one end to the other, thereof, .the parts which are thus folded and the parts which are thus bent being lirstcut away to form spaced perforations on transverse lines so inclined las to lie in helices in the finished tube with the helix of the perforations in the, ribs spaced from the helix of the perforations in the indentations. i

7. The herein described rnethodiof Inaking an expansion shield which consists of cutting out a sheet metal blank 'having flaring sides, cutting said blank to form spaced perforations, making `longitudinally disposed bends in the perforated parts of the blank to bring said sides substantially parallel, and folding said blank transversely into a tube. i v i 8. An expansion shieldof sheet metal with parts of the instal folded to forni tapered multi-ply ribs. and folded transversely into a tube having edges of the metal extending from one endto theother thereof, the parts which are thus folded being first cut away to forni spaced perforations. Y e

9. An expansion shieldof sheet metal with parts thereof `bent Vto Aform longitudinal tapered indentations, versely into a tube having edges of the instal extending from one end to the other thereof, the parts which are thus bent ybeing first eut away to form spaced perforations. l0. An expansion shield formed from a blank of sheetmetal having a smaller transverse dimension4 atrone end than at the other end thereof, withparts ofthe Inetal folded to form tapered multi-ply ribs and other parts bent to form indentations sub` stantially parallel with said-ribs, and folded transversely into a tapered tube having and `folded ttrans-` edges of the metal extending from one end to the other thereof, the parte which are thus 'folded and the parte which are thus bent being first eutaway to forni tapered peii'omtions.

ll. An expansion shield of' sheet metal with parte of the metal folded to form ribs 0l: a plurality of thicknesses, the parts Which are 'thus folded being` cut away to form spaced perorations, and the metal being 10 ln Witness whereof, l have hereunto set my hand this 31st day of March, 1920.

JOSEPH KENNEDY. lVitness:

I. B. MOORE. 

